Refactor index (#156)

* feat: add Telegram channel with agent swarm support

Add Telegram as a messaging channel that can run alongside WhatsApp
or standalone (TELEGRAM_ONLY mode). Includes bot pool support for
agent swarms where each subagent appears as a different bot identity
in the group.

- Add grammy dependency for Telegram Bot API
- Route messages through tg: JID prefix convention
- Add storeMessageDirect for non-Baileys channels
- Add sender field to IPC send_message for swarm identity
- Support TELEGRAM_BOT_TOKEN, TELEGRAM_ONLY, TELEGRAM_BOT_POOL config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: add index.ts refactor plan

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: extract channel abstraction, IPC, and router from index.ts

Break the 1088-line monolith into focused modules:
- src/channels/whatsapp.ts: WhatsAppChannel class implementing Channel interface
- src/ipc.ts: IPC watcher and task processing with dependency injection
- src/router.ts: message formatting, outbound routing, channel lookup
- src/types.ts: Channel interface, OnInboundMessage, OnChatMetadata types

Also adds regression test suite (98 tests), updates all documentation
and skill files to reflect the new architecture.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* ci: add test workflow for PRs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: remove accidentally committed pool-bot assets

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(ci): remove grammy from base dependencies

Grammy is installed by the /add-telegram skill, not a base dependency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -11,13 +11,15 @@
     "auth": "tsx src/whatsapp-auth.ts",
     "typecheck": "tsc --noEmit",
     "format": "prettier --write \"src/**/*.ts\"",
-    "format:check": "prettier --check \"src/**/*.ts\""
+    "format:check": "prettier --check \"src/**/*.ts\"",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "@whiskeysockets/baileys": "^7.0.0-rc.9",
     "better-sqlite3": "^11.8.1",
     "cron-parser": "^5.5.0",
-    "pino": "^9.6.0",
+"pino": "^9.6.0",
     "pino-pretty": "^13.0.0",
     "qrcode-terminal": "^0.12.0",
     "zod": "^4.3.6"
@@ -26,9 +28,11 @@
     "@types/better-sqlite3": "^7.6.12",
     "@types/node": "^22.10.0",
     "@types/qrcode-terminal": "^0.12.2",
+    "@vitest/coverage-v8": "^4.0.18",
     "prettier": "^3.8.1",
     "tsx": "^4.19.0",
-    "typescript": "^5.7.0"
+    "typescript": "^5.7.0",
+    "vitest": "^4.0.18"
   },
   "engines": {
     "node": ">=20"